In the NYTimes Spelling Bee game, you have to make words (4+ letters long) using a set of 7 letters, one of which must be used in the word. This is fairly trivial to make a regex for:
grep '^[bluntam]\{4,\}$' /usr/share/dict/words | grep u
(All lowercase to avoid acronyms and proper nouns) Is there a way to combine these into one fancy regex? The issue with putting the required letter in the center, like [bluntam]*u[bluntam]* is that there needs to be another filter to ensure the word length. I'm ok with using PCRE or any other standard bash tools.
How about this?
Positive lookahead for u, then match 4+ characters?
grep -P '^(?=.*u)[bluntam]{4,}$' /usr/share/dict/words